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GOODWILL AND INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jul. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of components of amortized intangible assets | he components of amortized intangible assets at July 1, 2017 and December 31, 2016 were as follows:
| July 1, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 196,201 |  |  | $ | 121,382 |  |  | 13 years
Proprietary Software & Database | 3,659 |  |  | 3,083 |  |  | 8 years
Patents & Proprietary Technology | 6,581 |  |  | 3,720 |  |  | 11 years
Other | 3,942 |  |  | 3,912 |  |  | 3 years
| $ | 210,383 |  |  | $ | 132,097 |  |  |
(4) GOODWILL AND INTANGIBLE ASSETS (Continued)
| December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 191,316 |  |  | $ | 111,342 |  |  | 13 years
Proprietary Software & Database | 3,616 |  |  | 3,056 |  |  | 8 years
Patents & Proprietary Technology | 6,434 |  |  | 3,420 |  |  | 11 years
Other | 3,713 |  |  | 3,668 |  |  | 3 years
| $ | 205,079 |  |  | $ | 121,486 |  |  |
Schedule of amortization expense for intangible assets | Amortization expense for intangible assets for the thirteen and twenty-six weeks ended July 1, 2017 and June 25, 2016, respectively was as follows:
Thirteen Weeks Ended |  | Twenty-six Weeks Ended
2017 |  | 2016 |  | 2017 |  | 2016
3,903 |  |  | 4,078 |  |  | 7,767 |  |  | 8,073 |
Schedule of future estimated amortization expense | Estimated annual amortization expense related to finite‑lived intangible assets is as follows:
| Estimated Amortization Expense
2017 | $ | 15,498 |
2018 | 13,840 |
2019 | 13,079 |
2020 | 11,989 |
2021 | 9,903 |
Schedule of non-amortized intangible assets | The carrying values of trade names at July 1, 2017 and December 31, 2016 were as follows:
| July 1, 2017 |  | December 31, 2016 |  | Year Acquired
Webforge | $ | 9,101 |  |  | $ | 8,624 |  |  | 2010
Valmont SM | 9,525 |  |  | 8,765 |  |  | 2014
Newmark | 11,111 |  |  | 11,111 |  |  | 2004
Ingal EPS/Ingal Civil Products | 7,420 |  |  | 7,032 |  |  | 2010
Donhad | 5,598 |  |  | 5,305 |  |  | 2010
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Industrial Galvanizers | 2,323 |  |  | 2,201 |  |  | 2010
Other | 14,193 |  |  | 13,747 |  |  |
| $ | 63,271 |  |  | $ | 60,785 |  |  |
Schedule of carrying amount of goodwill | The carrying amount of goodwill by segment as of July 1, 2017 and December 31, 2016 was as follows:
| Engineered Support Structures Segment |  | Energy & Mining Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  |  | Total
Balance at December 31, 2016 | $ | 94,314 |  |  | $ | 72,212 |  |  | $ | 75,404 |  |  | $ | 59,569 |  |  | $ | 19,611 |  |  |  | $ | 321,110 |
Foreign currency translation | 2,885 |  |  | 4,628 |  |  | — |  |  | 483 |  |  | 602 |  |  |  | 8,598 |
Balance at July 1, 2017 | $ | 97,199 |  |  | $ | 76,840 |  |  | $ | 75,404 |  |  | $ | 60,052 |  |  | $ | 20,213 |  |  |  | $ | 329,708 |

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